Something I sent to the US is now in Jamaica, that is, Jamaica NY International Distribution Center, in Queens, New York City, New York State, USA.
I read the US Postal Service's page about that place, but it did not answer my main question, namely, why is it called Jamaica?
@elfi I found https://www.nytimes.com/2014/07/06/nyregion/what-is-jamaica-queens-named-after.html